Sealed r. f. crimp type coaxial connector means



D 1966 E. w. FORNEY, JR 3,290,640

SEALED R.F. CRIME TYPE COAXIAL CONNECTOR MEANS Filed May 22, 1964 5Sheets$heet 1 Dec. 6, 1966 E. w. FORNEY, JR 3,290,640

SEALED R.F, CRIMP TYPE COAXIAL CONNECTOR MEANS Filed May 22, 1964 5Sheets-Sheet fr IIYVZLN'TOR. EDC-AR WILMOT FoRNEy Tt BY ha f Dec. 6,1966 E. w. FORNEY, JR 3,290,640

SEALED R.F. CRIMF TYPE COAXIAL CONNECTOR MEANS Filed May 22, l964 5Sheets$heet IN VENTOR.

\J' d a Eve/w \A/ILMOT Foaueyflu. 3 BY M4; ZFWJL United States Patent3,290,640 SEALED RF. CRIMP TYPE COAXIAL CONNECTOR MEANS Edgar WilmotForney, Jr., Harrisburg, Pa, assignor to AMP Incorporated, Harrisburg,Ra. Filed May 22, 1964, Ser. No. 369,509 Claims. (Cl. 33I77) Thisinvention relates to RF coaxial connectors of the type which are crimpedto coaxial cable.

There has been developed a specialized coaxial cable for carrying RFsignals from antenna and distribution points to receivers whereinportions of the cable are exposed to adverse environment. The cable isso constructed as to withstand both the strains of pole mounting and themoisture present in underground installation. A typical application ofthe cable is that of closed circuit television systems for educationaluse wherein a single classroom presentation is distributed to thevarious schools of a given district. Another typical installation is fortemporary hookup between numbers of portable transmitters and receiversinstalled for sports events, political conventions and the like. In suchuses the cable may be found swinging freely from extensive overheadspans or barely covered in shallow trenches temporarily and hastilyaccomplished. In any use the cable must maintain its dimensionalintegrity to avoid shorting between the spaced coaxial paths or signaldistortion which may be caused if there is a displacement of one signalpath relative to the other path. For this reason the cable is of arelatively heavy construction having about the outer conductive pathseveral layers of armor made of spiraled metal foil, all over-coveredwith a thick, tough insulating sheath. The ruggedness of the cable, inconjunction with requirements of low connection cost, have produced asubstantial problem with respect to both the design of a connectorcompatible with the uses to which the cable is put and to a method ofconnection which involves a minimum of labor for installation.

The prior art approach has produced a connector which employs soldering,crimping and considerable taping. In one example the construction of theconnector is such that the cable must be carefully disassembled and thenpartially reassembled with layers of insulating tape ap plied in variousstages of assembly. The cable as connected with prior art devices mustbe separately supported to avoid strains applied to the connection, andspecial care must be taken in pratically every point of assembly. Tomake the connection of the prior art gas tight various liquid sealersare applied at points within the connector, the parts having beenscuffed and prepared prior to application or" the sealers, with five orten minutes allowed for drying of the sealers prior to completion ofassembly. Prior art approaches have for the foregoing reasons notrepresented an adequate solution, since the assembly of the connectorrequires a high degree of skill and considerable time for installation.

Accordingly, it is one object of the present invention to provide an RFconnector which permits a simple and rapid installation on armoredcoaxial cable.

It is a further object of the invention to provide a coaxial connectorwhich is cn'mped to armored coaxial cable and which is sealed towithstand positive pressure loading by seals carried by the connectorparts.

It is another object of the invention to provide an improved coaxialcoconnector construction wherein internal seals are eliminated so thatgas pressure is maintained in the contact areas of the connector.

It is a further object of the invention to provide an RF connector forarmored coaxial cable which is capable of withstanding mechanical loadsand the effects of temperature, moisture and pressure to a degreeapproaching that of the cable itself.

In the drawings:

FIGURE 1 is a perspective view of a pair of mating halves which form theconnector of the invention both, being positioned and crimped on armoredcoaxial cable;

FIGURE 2 is a perspective view of the type of armored cable served bythe invention;

FIGURE 3 is a longitudinal sectional view showing the sleeve of theconnector of the invention positioned and crimped on such cable;

FIGURES 4 and 5 are longitudinal sections of the connector halves of theinvention;

FIGURES 69 are plan views depicting the preparation of coaxial cable forassembly with the connector of the invention;

FIGURES l0l2 are plan views showing respectively, crimping of the centercontact member to the cable, the disposition of cable for assembly to aconnector half and final assembly prior to crimping the outer conductorof the cable.

Referring now to FIGURE 1, the coaxial cable is shown as 10 and 10terminated respectively to coaxial connector halves 3t and 3b which areadapted to be intermated to connect cables 16 and 10'. In FIGURE 2, thegeneral construction of the cable is shown to include a centerconductive member 12, an outer conductive member 14 coaxially disposedwith respect to 12 and spaced therefrom by a series of insulating plugs16 (one of which is shown), an outer armor layer 20 and protectiveinsulating shield 22. The center conductor 12 is typically solid copperrod and the outer conductor 14 is typically copper sheet material. Thecenter conductor 12 is positioned and held relative to 14 by the seriesof spaced plugs lid of dielectric material such as polyethylene, each ofwhich is apertured as in 18 to permit the passage of gas for maintainingthe cable under positive pressure. The armoring layer 20 is typically ofsteel tape wound in two layers about outer conductor 14. The insulatingshield 22 is typically of a flexible high density polyethylene. Cable ofthis type can be permanently installed upon telephone poles suspendedfrom messenger wire or placed in underground conduit and still maintainits integrity without causing the conductor members to short out or beso displaced as to cause signal distortion. Cable of this type may alsobe utilized for temporary installation on or slightly below the groundin the presence of moisture and other contaminants for limited periodsof time. The connector of the invention serves to provide an all-crimptype connector permitting a quick disconnect between cable halves orbetween a cable end and some piece of equipment. In the latter use, amember having the general mating characteristics of 30 may be foundmounted on some piece of equipment such as an amplifying station withthe cable terminated in a half such as 30 which is threaded therein. Itis preferred to use the connector half 39 for attachment to the cableand the half 34 for attachment to the equipment so that the gas loadingport 70 will be available to the line, without requiring a similar porton both halves.

From FIGURES 1 and 3 it can be seen that the connector of the inventionfeatures for each half a forward portion adapted to mechanically andelectrically interconnect the inner and outer conductors ofthetransmission line formed by the cable. The rear portions of eachconnector half include a ferrule or sleeve member crimped at two pointsC and C to the cable. Before going into a further description of thesleeve, the crimp and the characteristics thereof, the description ofeach of the connector halves will be given. Referring to FIGURE 4 and tothe plug half of the connector shown as 30 there is included themetallic sleeve member 32 having a forward portion which serves to housecoaxially disposed therein a central pin member 60, a rearward portion34 which may be integrally formed therewith and a forward portion shownas 40 which serves to provide the mechanical connection to half 30' Thehalf 30' is substantially identical in function to 30, but includesreversed portions to provide complementary connecting faces for thecentral pin member and the outer portions. The sleeve extension 34 ismade to be sufficiently strong to withstand the crimping force appliedthereto to terminate the cable to the connector half in the manner shownin FIGURE 3 and includes a beveled end shown as 36 to facilitateassembly to the cable. Along the outer surface of 34 are provided aseries of annular recesses shown as 38 which operate as the rearwardsleeve member is crimped thereover to better grip the copper outerconductor 14 of the cable. Fitted over 34 and adjacent to the body of 32as shown in FIGURES 3, 4 and is a gasket 35 of insulating and elasticmaterial which is preferably sized so as to be retained in positionunder a slight elastic deformation to avoid the need for additionalloose pieces during shipment and storage of the connector halves priorto installation on a cable. The gasket 35 is preferably flat andrelatively thin to permit a use as shown in FIGURE 3 wherein upon theouter sleeve being crimped the gasket is compressed to provide a sealbut not crushed as would be the case if it were of greater thickness.

The forward portion 40 includes an internal recess 41 locked by a ringsuch as 42 to the member 32, the sleeve being internally threaded as at44 to engage complementary external threading 44' on half 30'. Disposedwithin 40 and against the end of 32 is a further gasket 46 adapted to beengaged and compressed by the end 46 of half 30' as it is threaded into30. The central bore shown as 33 in half 30 includes at its forward endoflfset 50 into which is mounted a metallic insert 48 having an annularradially extending flange 50 locked within 51. Adjacent member 48 at therearward portion thereof and secured within bore 33 is an insulatingspacer 52 preferably of dielectric material such as Teflon seated andheld against axial movement in the forward direction by 48 and in therearward direction by a slight flange shown as 54 formed in the bore 33.The insulating member 52 includes a small aperture therein shown as 56to permit the passage of gas to provide positive pressure on the contactsurfaces. Disposed within and held by 52 is the central pin member ofthe connector half shown as 60. The central pin member is positioned asindicated in FIGURE 4 and includes a reduced forward portion 62 adaptedto aid in the engagement of 60 with the complementary half 60' of half30. Rearwardly of the central portion of 60 is a sleeve portion 64preferably integrally formed therewith a series of crimps indicated as Care applied to terminate 60 to the center conductor 12 of the cable.With 60 mounted as indicated in FIGURE 4 it is held against radialdisplacement by the insulating member 52. The difference in radiusbetween 64 and the body of the pin provides a face 68 which bearsagainst the rearward surface of 52 to both lock the assembly againstaxial displacement out of the connector half and to aid in assembly. I

The half 30' is substantially identical to the half 30 except that itincludes complementary mating portions for the inner and outerconductive paths. Additionally, the half 30' includes a gas access port72 formed by a threaded plug shown as 70 which leads to a small portentering into the main bore of 30. An 0 ring or gasket seal 74 isprovided between the plug and the inner portion 33 of the connector halfsuch that as plug 70 is threaded into the member the gasket 74 operatesto seal against escape of gas. As one further difference, there isincluded in the forward end of 30' an insert 49 which is adapted toengage the members of the forward portions of member 48 of 30 which arepreferably provided with spring characteristics so as to be held incontact with the inner surface of 49 when the two halves are engaged.

As should be apparent to those skilled in the art, the halves 30 and 30'serve to provide a mechanical disconnect and holding feature to theconnector. The energy transmitted by the connector is carried throughthe insulating medium along the inner bore of each half, such being airin the rearward portions, dielectric plugs 52 and 52 in the centerregion and air again in the zone of the inner-mating surfaces.

The assembly procedure with respect to halves 30 and 30 is identical andproceeds as is indicated in FIG- URES 6-12; As a first step the cable 10is stripped as indicated in FIGURE 6 with the sheath 22 being removedfor a length to expose the armoring layer 20. The armoring layer is thenremoved to leave a portion showing as indicated in FIGURE 7. Thereafter,the sleeve member shown as is then positioned on the cable in the mannershown as FIGURE 8, its insertion being exactly positioned by the reasonof the diameters of the different parts thereof; i.e., theinitialinsertion being limited by the change in diameter 86 shown in FIGURE 3,engaging the stripped end of sheath 22. With the sleeve so mounted theremaining portion of the copper jacket 14 extending beyond the portion82 of the sleeve is removed as indicated in FIGURE 9. The configurationof the sleeve 80 may thus be seen to facilitate assembly by permitting14 to be torn off against the edge thereof.

Next, the central pin member 6%) is positioned on conductor 12, plug 16being removed, the end of 12 being seated within sleeve position 64thereof.

With pin 60 so positioned it is then crimped to conductor 12 in themanner indicated in FIGURE 10, the crimp being formed by spacedindentations shown as C in FIGURE 4. The type of crimp preferred is thatof a square crimp. Alternatively, and in instances where it is desirableto reduce electrical discontinuities within the connector, the techniqueshown and described in US. patent application Ser. No. 268,873, filedMar. 29, 1963, now Patent No. 3,212,050 in the name of F. B. Stark, maybe employed. With the pin member 60 then attached to conductor 12 andwith sleeve 80 positioned as indicated in FIGURE ll, the cable is thenworked forwardly, pin 60 being fitted within the bore of the member 52of half 30 to a point wherein the portion 68 stops further insertion ofthe assembly. At this point the connector sleeve is pushed forward sothat it will be properly positioned relative to portion 34, being closeto the pin thereof adjacent to 32 and overlying the gasket 35 asindicated in FIGURE 12. So positioned, the sleeve 80 is then preferablycrimped at two spaced points in the manner indicated in FIGURE 3. Ateach of the crimps shown as C and C it is preferred that an 0 type crimpbe applied at spaced points with the indentation being limited to deformthe outer conductive sleeve 14 as little as possible and still maintaina tight connection. As shown in FIGURE 3 the rear indentations C formedby crimping are down against the armoring of the cable which serves toresist deformation of the inner member 14 by distributing the forces ofcrimping. The forward crimp C is directly over the outer conductivemember 14 and against the sleeve 34 which itself serves to preventinward displacement of the outer conductor 14 to cause signal distortionor even shorting between the outer conductor 14 and the inner conductor12. Preferably, the end of 14 is abutted against the body of 32 so thatthe innermost crimp of C compresses the gasket to seal the connectionagainst entry of contaminants. The bore of 34 is held to be as close tothe inner diameter spacing between 12 and 14 as is feasible withsufiicient strength left in the sleeve to resist crushing during thecrimping operation.

Turning now to a description of sleeve 80, reference to FIGURE 3 willshow the sleeve to include sections of two diameters, the sections beingformed of portions 84 and 92 substantially of the same diameter and thesection 82 of a substantially smaller diameter. The sections 84 and 92are approximately the outer diameter of the cable including the sheath22 and the portion 82 is of a diameter approximating the maximumexpected production diameter of the outer conductive member 14. Thelength of the portions are such that 84 and 92 extend outwardly oversubstantial portion of the cable to provide mechanical support for thecable and the portion 82 extends the length of member 34 plus anadditional length before the transition point 86 is reached. The sleeve84 is preferably of the construction shown being formed in two piecesfor ease of manufacture. The portions 82 and 84 are formed in one pieceand the portion 92 is formed of a separate piece, the different piecesbeing joined in the manner indicated by reason of an outwardly flaredportion 88 of 84 which is locked and held by an outwardly flared portion94'of 92. Within the cavity formed by portions 88 and 94 there isprovided an O ring or gasket 90 of a relaxed diameter to rest within thecavity and extend inwardly to a diameter slightly less than that of thesheath 22. Upon insertion of the cable as prepared in the manner abovedescribed the gasket 90 is loaded in compression to effectively sealagainst entry of contaminants either from the portions of the pathbetween 88 and 94 or from a point on the opposite side of the crimps CThe rear part of the connector of the invention thus then has only twogaskets and both are normally carried in the position of use so as toavoid a separate loose piece requirement.

The relative lengths of the portions making up 80 are such as tofacilitate preparation of the cable, a comparison being made duringstripping with these lengths and, as mentioned in assembly, with theinsertion of the cable within the sleeve being controlled by 86. Therelatively long length of the sleeve combined with the placement of thecrimps C and C at the ends thereof serves to quite adequately supportthe connector on the cable against either axial, radial or torsionalloading. It has been found in actual practice that the connector tensilecrimped as indicated approaches that of the cable itself. It has beenfound in actual use that the cable prepared in accordance with theinvention may be loaded under positive pressure with a gas and placedunder tensional strains to the same extent as if the cable wereterminated in the more laborious fashion of the prior art.

While the invention is particularly directed to armored coaxial cable ofthe type utilized to transmit RF cornrnunication signals and other typehaving the construction shown, it should be appreciated that it iscontemplated that the technique employed and the features of theinvention may be used with many of the specialized cables beingdeveloped having the same general characteristics as the cable shown.For example, the connector may be utilized with conductors havingcontinuous dielectric material rather than the spaced insulating plugsas shown and/or with cable having a different type of outer conductorsuch as braiding or the like. It is also contemplated that the inventionmay be used directly with fixed connections wherein the rear componentsof the connectors of the invention including the sleeve such as 34 andthe shell such as 88 are as shown, and the forward outer innermatingportions are of one piece. In such case the inner portions including thepins 58 and 68 will be substantially as shown to fit within insulatingplug members similar to 52 and 52' which are carried in an integralconstruction joining the two. The sleeve construction of the inventionhas been found to be particularly useful in terminating a relativelylarge cable to a relatively small cable or connector.

Changes in construction will occur to those skilled in the art andvarious apparently different modifications and embodiments may be madewithout departing from the scope of the invention. The matter set forthin the foregoing description and accompanying drawings is offered by wayof illustration only. The actual scope of the invention is intended tobe defined in the following claims when viewed in their properperspective against the prior art.

What is claimed is:

1. In a coaxial connector for cable of the type having an innerconductor surrounded by dielectric material and an outer conductorfurther surrounded by a protective sheath, the combination including apair of connector halves having conductive outer shell portions andconductive center pin members each supported by a dielectric plug memberwithin the shell member, the outer shell and inner contact pin member ofthe halves being intermatable, each connector half including a rearextension and a sleeve member adapted to be crimped thereover tomechanically join the cable to the connector half, the rear extensionbeing of a diameter to fit within the outer conductor of the cable andthe sleeve member including a forward portion adapted to be fitted overthe cable outer conductor and crimped inwardly to common the outerconductor to the extension, the sleeve member further including a rearportion of greater inner diameter sized to fit over the outer protectivesheath of the cable and to be crimped inwardly to grip the cable at apoint spaced from the first mentioned crimp, the sleeve includingintermediate the two crimps an internal recess carrying a gasket memberof a diameter less than that of the outer diameter of the cable sheathsuch as to be held in compression when said sleeve is mounted on saidcable to terminate each said connector half.

2. The connector of claim 1 wherein there is further included a gasketdisposed on each connector half rear extension proximate the forward endof said sleeve overlying said extension and said first mentioned crimpserves to compress said gasket inwardly against said sleeve to sealagainst ingress or egress of gas or contaminants within said connectorhalf.

3. The connector of claim 1 wherein the supporting plug members includeports wherein the innermating contact surfaces of the center conductivepin members are maintained under positive pressure when said cable isloaded with gas.

4. The connector of claim 3 wherein one of said connector halvesincludes a scalable mit said connector and thus said positive gaspressure.

5. An improved means for connecting coaxial cable to a coaxial connectorhalf wherein the cable is of a type having a center conductor surroundedby dielectric material and an outer conductor in turn surrounded by alayer of protective armor and an insulating sheath, said means includinga sleeve member having a forward portion of reduced diameter adapted tobe fitted over a connector back-up extension and crimped inwardly overthe cable outer conductor and said extension to terminate the outerconductive path of said cable to the connector half, a further portionof an internal diameter approximating that of sheathing of said cableand adapted to be crimped at the end thereof opposite to said forwardportion inwardly against the cable sheath and the protective armor tomechanically link said sleeve member to said cable and thereby saidcable to said connector half, an intermediate portion of larger diameterthan said second mentioned portion including an internal recess havingtherein a gasket held in compression against the sheathing of said cableto seal against egress or ingress of gas vapor or the like.

6. The means of claim 5 wherein forward and further portions are joinedat the intermediate portion by a mechanical joint with the forwardportion crimped to the cable sheath extending over and around an end ofthe further portion crimped to the connect-or extension and the saidgasket is disposed within said last mentioned end.

7. An improved means for connecting coaxial cable having an innerconductor surrounded by dielectric material, an outer conductor and aninsulating protective sheath cable to be loaded under gas port adaptedto perwith said cable stripped to expose axial segments of the inner andouter conductors, a forward connector portion having outer and innerconductive means to connect with complementary portions of a furtherconnector half, a rear extension attached to said forward portion andadapted to receive the cable outer conductor thereover, a sleeve memberof conductive metal, said sleeve member including first and secondportions of an inner diameter slightly larger than the outer diameter ofthe cable and a third portion of an inner diameter slightly greater thanthe cable outer conductor and adapted to be fitted thereover and overthe extension and crimped thereagainst, the first portion of said sleevemember being adapted to be crimped against the cable outer surfacewhereby said cable is mechanically and electrically connected to saidcable, the said sleeve member including between said first and secondportions a compressible seal having a relaxed inner diameter less thanthe outer diameter of the cable whereby to seal said connector halfconnection to said cable.

8. An improved ferrule construction for crimp type connectors includinga first member of an inner diameter approximately equal to the cableouter diameter, a second member having a first portion of an innerdiameter approximately equal to the cable outer conductor diameter and asecond portion approximately equal to the cable outer diameter, themembers being of a malleable material adapted to be crimped over a cableend to terminate said cable to a connector, the said members beingjoined with the ends thereof defining an outwardly extending innerspace, a compressible gasket of a configuration to be held in said spacewith a surface extending inwardly to a diameter less than the innerdiameter of the said first member.

9. An improved means for connecting coaxial cable having an innerconductor surrounded by dielectric material, an outer conductor and aninsulating protective sheath, a connector half including a forwardconnector portion having outer and inner conductive means to connectwith complementary portions of a further connector half, a rearextension attached to said forward portion and adapted to receive thecable outer conductor thereover and a sleeve member of conductive metal,said sleeve member including first and second portions of an innerdiameter slightly larger than the cable outer diameter and a thirdportion of an inner diameter slightly greater than the cable outerconductor and less than the outer diameter of the cable, the second andthird portions of said sleeve member being joined together to include aninterior radial face operable upon the said sleeve members being fittedover said cable and forced axially such that the interior radial faceproperly positions said sleeve member on said cable by engagement withthe end of said protective sheath whereby the third portion may befitted over said extension and outer conductor and crimped inwardly tomechanically and electrically connect such to the said connector halfand the first portion may be crimped inwardly against said protectivesheath to mechanically connect and seal said cable to said connectorhalf.

10. In a means for connecting a coaxial cable of the type having aninner conductor surrounded by dielectric material, an outer conductorand a protective insulating sheath with said cable being stripped toexpose a length of the inner conductor and a length of said outerconductor axially extending from the end of said protective sheath, aconnector half including a forward portion having outer and innerconductive means to connect with complementary portions of a furtherconnector half, said forward portion including a rear extension havingan outer diameter to fit within the cable outer conductor, a boreextending through said outer conductive means including said rearextension, a dielectric plug fitted within the bore in the forwardportion of said connector half, said plug having an aperture centrallydisposed therein of a given diameter and having a rear face positionedat a given point axially removed from the forward end of the forwardportion, the inner conductive means being comprised of a member having aforward contact portion of a diameter to fit within the aperture of saidplug and be supported coaxially of said outer conductive means andadjacent to said contact portion a further portion of a diameter largerthan the said given diameter to define a transverse face, the said innerconductive means being crimped to the inner conductor of said cable andinserted through said rear extension until said transverse face is inengagement with said plug, a malleable sleeve member including a rearportion of one diameter and a forward portion of lesser diameter joinedto define an interior radial face, the rear portion having an innerdiameter being approximately equal to that of the protective sheath ofsaid cable so as to fit thereover and the forward portion inner diameterbeing slightly larger than the outer diameter of said rear extension soas to fit thereover, the said radial face serving to engage said end ofsaid protective sheath to position said member thereon and on said rearextension whereby the sleeve member may be crimped on the rear andforward portions to mechanically and electrically join said connectorhalf to said cable.

References Cited by the Examiner UNITED STATES PATENTS 2,681,440 6/1954Swengel 339-276 X 2,798,113 7/1957 Koller et a1. 339-177 X 3,212,05010/1965 Stark 339103 X 3,227,993 1/1966 Bentley 339177 FOREIGN PATENTS1,307,063 9/ 1962 France.

EDWARD C. ALLEN, Primary Examiner.

W. DONALD MILLER, Examiner.

1. IN A COAXIAL CONNECTOR FOR CABLE OF THE TYPE HAVING AN INNERCONDUCTOR SURROUNDING BY DIELECTRIC MATERIAL AND AN OUTER CONDUCTORFURTHER SURROUNDED BY A PROTECTIVE SHEATH, THE COMBINATION INCLUDING APAIR OF CONNECTOR HALVES HAVING CONDUCTIVE OUTER SHELL PORTIONS ANDCONDUCTIVE CENTER PIN MEMBERS EACH SUPPORTED BY A DIELECTRIC PLUG MEMBERWITHIN THE SHELL MEMBER, THE OUTER SHELL AND INNER CONTACT PIN MEMBER OFTHE HALVES BEING INTERMATABLE, EACH CONNECTOR HALF INCLUDING A REAREXTENSION AND A SLEEVE MEMBER ADAPTED TO BE CRIMPED THEREOVER TOMECHANICALLY JOIN THE CABLE TO THE CONNECTOR HALF, THE REAR EXTENSIONBEING A DIAMETER TO FIT WITHIN THE OUTER CONDUCTOR OF THE CABLE AND THESLEEVE MEMBER INCLUDING A FORWARD PORTION ADAPTED TO BE FITTED OVER THECABLE OUTER CONDUCTOR AND CRIMPED INWARDLY TO COMMON THE OUTER CONDUCTORTO THE EXTENSION, THE SLEEVE MEMBER FURTHER INCLUDING A REAR PORTION OFGREATER INNER DIAMETER SIZED TO FIT OVER THE OUTER PROTECTIVE SHEATH OFTHE CABLE AND TO BE CRIMPED INWARDLY TO GRIP THE CABLE AT A POINT SPACEDFROM THE FIRST MENTIONED CRIMP, THE SLEEVE INCLUDING INTERMEDIATE THETWO CRIMPS AN INTERNAL RECESS CARRYING A GASKET MEMBER OF A DIAMETERLESS THAN THAT OF THE OUTER DIAMETER OF THE CABLE SHEATH SUCH AS BE HELDIN COMPRESSION WHEN SAID SLEEVE IS MOUNTED ON SAID CABLE TO TERMINATEEACH SAID CONDUCTOR HALF.